I love gadgets and tools so have just about tried every brand/tool out there. My ideal set up now which I have in the van is:
Powertools
Bosch 36v Cordless Li-on SDS
Bosch 10.8v Li-Ion Driver
Megger MFT1552
Bosch 110v Corded SDS
110V Transformer
2 x 14m 110V Extention leads
1 x 110v Worklamp
1 x AEG 18v Circular Saw (For floorboards etc)
In my toolbag
Knipex Side Cutters
Knipex Pliers
Irazola Screwdriver Set
16oz Estwing Hammer
3lb Estwing Lump Hammer
1" Scutch
1.5" Scutch
Floorboard Chisel
Irwin Padsaw
Fluke T3 Voltage Tester
Socket & See SOK 32 Tester
Petzl Headlamp
Fluke LVD Voltstick
Knipex Cable Cutters
Stanley FatMax Knife
Knipex Waterpump Pliers
Bahco Adjustable Spanner
Bahco 6" Square
Assorted Pencils & Sharpie pens
Compass & Ruler (For marking out downloght holes etc)
2 x Tapes ( 1 x 3m & 1 x 7m)
20 & 25mm Morse Holesaws
Lots of Insulated Tape
Small Allen Key set
Small Torq Set
Facom Large Hacksaw
Knipe Insulated Junior Hacksaw
I also bought a great Stabila set for ÂŁ39 with 3 levels in and you got some free pencils and a keyring. I am also trying to find a decent file (Half Round) to keep the auger bits sharp and also tidy up when cutting metal trunking etc.
Some of the brands are horrendously expensive but if you look around you can always get some great deals.
The most useful thing I have done now is buy a large metal screwcase and have filled it with screws, plugs, washers, grommets, drill bits and other useful things for everyday use.
I only drink cold drinks so I'm afraid no kettle, however I bought a coolbox last summer and it is always in the back of the van.
Hope this helps